package com.hsm9;

import java.util.HashMap;

public class Test {
    public static void main(String[] args) {
        HashMap<Integer,String> hs = new HashMap<>();
        System.out.println(hs.put(12, "hsm"));
        System.out.println(hs.put(13, "cy"));
        System.out.println(hs.put(15, "wyt"));
        System.out.println(hs.put(17, "fc"));
        System.out.println(hs.put(12, "cy"));
        System.out.println(hs);
        System.out.println(hs.size());
    }
}
